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Intangible Assets
 6 Months Ended
Jul. 26, 2015
Notes to financial statements [Abstract]  
Intangible Assets
Intangible Assets
 
The components of our amortizable intangible assets are as follows:
 
July 26, 2015
 
January 25, 2015
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net Carrying
Amount
 
Gross
Carrying
Amount
 
Accumulated Amortization
 
Net Carrying
Amount
 
(In millions)
Acquisition-related intangible assets
$
193

 
$
(143
)
 
$
50

 
$
189

 
$
(134
)
 
$
55

Patents and licensed technology
451

 
(311
)
 
140

 
449

 
(282
)
 
167

Total intangible assets
$
644

 
$
(454
)
 
$
190

 
$
638

 
$
(416
)
 
$
222



Amortization expense associated with intangible assets was $19 million and $38 million for the three and six months ended July 26, 2015, respectively, and $19 million and $38 million for the three and six months ended July 27, 2014, respectively. Future amortization expense related to the net carrying amount of intangible assets at July 26, 2015 is estimated to be $35 million for the remainder of fiscal year 2016, $65 million in fiscal year 2017, $50 million in fiscal year 2018, $22 million in fiscal year 2019, $13 million in fiscal year 2020 and a total of $5 million in fiscal year 2021 and beyond.